Bridge-Mono Operation, Parallel-Mono Operation

Micro-Tech Series Power Amplifiers

6 Principles of Operation

To further protect the output stages, the pat- ented ODEP circuitry is used. It produces an analog output proportional to the always changing die temperature of the output transis- tor. This output controls the translator stage previously mentioned, removing any further drive that may exceed the safe operating area of the output stage.

Thermal sensors S100 and S200 give the ODEP circuits vital information on the operat- ing temperature of the heat sink on which the output devices are mounted.

Should the amplifier fail in a way that would cause DC across the output lead, the DC pro- tection circuit senses this on the negative feed- back loop and shuts down the output stage drive until the DC is removed.

6.2.2 Bridge-Mono Operation

By setting the back panel stereo/mono switch to Bridge-Mono, you can convert a Micro-Tech amplifier for bridged-mono operation. With a signal applied to the channel 1 input and the load connected between the positive (+) output terminals, twice the voltage can be delivered to the load.

The channel 1 output feeds the channel 2 error amp U204-A. The signal feeding channel 2 is inverted so the channel 2 output will have the

opposite polarity of channel 1. This makes it possible to deliver twice as much voltage to the load while the protection mechanisms for each channel continue to work independently.

6.2.3 Parallel-Mono Operation

With the stereo/mono switch set to Parallel- Mono, the output of channel 2 is paralleled with that of channel 1. A suitable jumper capable of handling high current must be connected across the positive (+) output terminals to gain the benefits of this operating mode.

The signal path for channel 1 is the same as previously discussed, except that channel 1 also drives the output stage of channel 2. The balanced input, error amp, translators, and LVAs of channel 2 are disconnected and no longer control the channel 2 output stage. The channel 2 output stage and protection mecha- nisms are also coupled through S1 and func- tion as one.

In Parallel-Mono mode, the amplifier can deliver twice the current of a single channel. Because the channel 2 ODEP circuit is coupled through S1, the amplifier gains additional pro- tection if a fault occurs in the channel 2 output stage. The channel 2 ODEP circuit will limit the output of both output stages by removing the drive from the channel 1 voltage translator.

Operation Manual

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